* {
  font-family: 'montserrat', sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background: #333;
}

.login-box {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100vh;
  /* vh 视口高度 viewport height 百分比单位*/
  background-image: linear-gradient(45deg,
    #9fbaa8,
    #31354c);
  /*设置颜色渐变 方向(0deg垂直向上) 起点颜色 终点颜色*/
  transition: 0.4s;
  /*过度效果  property duration timing-function delay 默认属性:all 0 ease 0*/
}

.login-form {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /*定义 2D 转换8 */
  color: white;
  text-align: center;
}

.login-form h1 {
  font-weight: 400;
  margin-top: 0;
}

.txtb {
  display: block;
  box-sizing: border-box;
  width: 240px;
  background: #ffffff28;
  border: 1px solid white;
  padding: 10px 20px;
  color: white;
  outline: none;
  margin: 10px 0;
  border-radius: 6px;
  text-align: center;
}

.login-btn {
  width: 240px;
  text-align: center;
  background: #2c3e50;
  border: 0;
  color: white;
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
}

.hide-login-btn {
  color: #000;
  position: absolute;
  top: 40px;
  right: 40px;
  cursor: pointer;
  font-size: 30px;
  opacity: 0.7;
  /* transform: rotate(45deg); */
  /*用+使用此方法变X定义 2D 转换8 */
}

.show-login-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  border: 2px solid;
  padding: 10px;
  cursor: pointer;
}

.showed {
  left: 0;
}
